Process of manufacturing carlines



Dec. 21 1926.

- C. D. BONSALL.

PROCES S OF MANUFACTURING 0111111111115 iled April 28, 192

Patented Dec. 21, 1926. i i UbllTE PATENT OFFIQE. Y

CHARLES DAVID BONSALL; OF PITTSBURGH, PENNSYLVANIA, ASSIGNOE '20 P. MURPHY COMZANY, OF NEW KENSINGTGN, PENNSYLVANIA. A CORPORATXGN OF PENNSYLVAITIA.

PROCESS OF MAN'EJ'FACTUR-ING CARLINES.

Application filed April 28, 1926. Serial No. 105,102.

My invention relates to carlines and procthe top and bottom of the carline (where the esses of manufacturing them. It has for its parts ofthe cross-section are more efficient principal object to produce a carline that in resisting bending stresses) to a minimum will be stiffer and stronger than previous thickness along the line of the neutral axis carlines of the same weight of metal and to, 13 thereof, where the metal is neither in tenfacilitate the manufacture and effect greater sion or compression. economy of material. The carline A is produced from a metal The invention consists principally in a blank comprising a flat rectangular piece of carline having a portion of its metal dismetal 14L- having two grooves 15 in each of posed substantially vertically and of miniits faces that extend longitudinally of said mum thickness along the neutral axis of the blank and are parallel to each other and the as carline; and it also consists in the process side edges thereof. The grooves on oneside of manufacturing such carline. of the blank are disposed opposite to the In the accompanying drawing, which grooves on the opposite side of the blank,

1 forms part of this specification and wherein whereby said blank is of, reduced thickness like symbols refer to like parts wherever along two lines parallel to each other and 70 they occur. 7 the side margins of the blank. The blank is Fig. 1 is a face view of a blank used in preferably produced by a rolling operation producing a carline embodying my invenand the carline shown in Fig. 3 is produced tion; from said blank by a pressing operation, the

Fig. 2 is an edge view of said blank; grooves in the blank being so located that 75 Fig. 3 is a side view of the carline prothey will lie in the plane of the neutral axis duced from the blank shown in Figs. 1 of the finished carline. It is noted that this and 2; reduced thickness of the metal along the Fig. 4 is an end view showing the cross neutral axis of the carline may be produced sectional shape of said carline on an en by means of deep grooves along one side 80 larged scale; only of the blank, instead of forming shal- Fig. 5 is a face view of a blank used in low grooves in both sides of the blank, as producing a carline which has a maximum shown.

depth at the middle of the carline and The carline B shown in Fig. 7 of the acgradually decreases in depth towards its companying drawing has across-sectional ends; shape similar to the cross-sectional shape of Fig. 6 is an end view of said blank; the carline A shown in Fig. 3, the chief dif- Fig. 7 is a side view of the carline proference between the two carlines being that as duced from the blank shown in Figs. 5 and the carline A is of uniform depth; whereas 6; and the carline B is deepest at its middle and no Figs. 8 and 9 are enlarged vertical crossgradually decreases in depth towards its sections taken through the carline shown in ends. The blank used to produce the carline Fig. 7 on the lines 8-8 and 9-9, respec- B is shown in Figs. 5 and 6 of the accomtively. panying drawing and comprises a rectangu- Referring to Figs. 1 to 41-, inclusive, of the lar piece of metal 14-. of flat section having as accompanying drawing, my invention is two grooves 15 formed in each of its side shown in connection with a pressed metal faces that extend obliquely to each other and carline A, said carline comprises a substanto the parallel side margins of said blank;

45 tially inverted channel-shaped section hav' that is, each side of said blank is provided mg outstanding base flanges 10 at the lower with two grooves that are spaced farther um edges of its side walls 11. As shown in the apart at the middle of the blank than at its drawing, the carline A slopes downwardly ends, whereby said grooves extend lengthfrom its middle towards its ends and is of wise of the blank in two lines that converge substantially uniform depth throughout its from the middle of the blank towards its length. The web 12 of the carline and the ends. By thus locating the grooves in the ma lateral base flanges 10 thereof are of uniproper position and at the proper angle, the form thickness; but the side walls 11 of said grooves are brought into a position adjacent carline taper from a maximum thickness at to the neutral axis 18 of the carline B when said blank is pressed up to form said earlinet The blank 14 is preferably produced by heating a rectangular plate and pressing it into'the shape shown.

The hereinbefore described carline has a cross-section adapted to resist greater stresses than previous cal-lines having the same Weight of metal; for it places the greater portion of the metal of the carline a greater distance from its neutral axis Where it is more efficient in resisting bending stresses than the metal adjacent to the neutral axis. It is noted that the carline gives a maximum load bearing stress with a minimum amount of metal and a minimum of weight and it lSHltICle from a single piece of metal of uniform width, thereby minimizing the cost of material and eliminating the operation of trimming the blank to a specialshape.

I do not \VlSl1 t()-' be limited to the type of car lines or cross-sectional shapes shown and described.

What I claim is:

1. The process of mamiiaeturing a metal ca'rline having a portion of its metal disposed vertically which consists in forming a flat meta-l blank with a longitudinal groove and then pressing said blank into the shape desired for the finished carline with the groove thereof disposed along the neutral axis of said car'l-ine.

2. The process of manufacturing a carline comprising a vertically disposed portion having a lateral flange which consists in rolling a rectangular plate With a longitudinal groove therein andthen pressing said plate into the shape desired for the finished carline with the groove disposed along the neutral axis of said carline.

The process of manufacturing a carline from a flat metal blank, which consists in providing the blank with longitudinal grooves symmetrically arranged with respect to the median line of the blank, and then pressing said blank into channel shape with said grooves in the neutral axis plane thereof.

4;; The process of manufacturing a metal carline having a portion of its metal disposed Vertically and gradually decreasing in depth from the middle of the carline toward the ends thereof which consists in forming a flat metal blank with a groove that extends obliquely to the center line of said blank at reverse angles on opposite sides of its middle, and then pressing said blank into the shape desired for the finished carline" with the groove in the neutral axis plane thereof.

Signed at New Kensington, Pa, this 23rd day oi April, 1926.

CHARLES DAVID BONSALL. 

